Carpenter s transit



Sept. l, 1925.

GARPENTER'S TRANSIT Filed April 20, 1921 2 Sheets-Shut 2 Patented Seprt. 1, 1925.

UNITEDSTATS 'rHoMAs c. LANE, or BALTIMORE, MARYLAND.

CARPENTERS TRANSIT.

Application led April 20, 1921. Serial No. 462,788.

To all whom it may concern Be it known that I, THOMAS C. LANE, a citizen of the United States, residing at Baltimore, in the city of Baltimore and State of Maryland, have invented certain new and useful Improvements in a Carpenters Transit; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and usethe same.

The object of the invention is to provide a simple and efficient apparatus in the nature of a transit for the use of carpenters for example in leveling and laying olf walls,

foundations, cellar bottoms and the like, but

equally adapted for use by other mechanics in similar operations where accuracy is required in following plans, directions and measurements; and the particular object in view is to provide an apparatushavingt-he functions and capabilities indicated whichv will not involve the cost of production incident to the transits and like instruments used by surveyors and which are unnecessarily complicated and expensive for the purpose of the mechanic as above outlined; and with these objects in view the inventionv consists in a construction, combination and relation of parts of which a preferred embodiment is shown in the drawing, where- Figure 1 is a front view of the apparatus.

Figure 2 is a plan view thereof.

Figure 3 is a side view partly in section.

Figure 4L is a perspective view of one of the sighting blocks and Figure 5 is a perspective view of the other sighting block.

rlhe apparatus consists essentiallyv of a turntable comprising the upper revoluble plate 10 and a lower fixed plate 11 of which the former is pivotally mounted centrally upon the latter, a supporting frame of the tripod form having a base 12 which supports the lower fixed plate or disk of the turn table which is attached thereto by securing screws 13, and the hingedly mounted folding legs 14 secured to the base, and a sighting member or frame 15 carried by the revoluble plate or disk of the turn table and adapted to be moved therewith to occupy any desired angular position or to be moved to anydesired degree of angular Y variation in a horizontal p-lane or in a plane perpendicular to the axis of the revoluble plate or disk 10.

The revoluble disk or plate in addition to being capable of movement upon a central axis consisting in the construction illustrated of a pivot bolt 16 extending downwardly through enlarged central opening in the fixed plate or disk V11 and the base 12, aftery initially positioning the apparatus is adapted-to be accurately adjusted angularly or leveled by means of leveling screws 17 of which four are shown in the drawing with their thumb heads 18 located below the plane of the undersurface of the base block 12, the guide in leveling the same consisting of any suitable form of leveling device such as the spirit level 2O on the sight, frame which is carried by the revoluble disk or plate, said leveling screws bearing terminally against the under surface of the disk or plate 10 and the spindle or pivot bolt 16 extending loosely through the opening provided for its reception in the base block 'and l lower stationary disks l1 and being fitted 80 with a coiled spring 21 bearing at its upper end against the under surface of the fixed plate or disk 11 and at its lower end upon a thumb nut 22 which may be adjusted tovary the tension of said spring and which for that purpose is threaded uponv the lower end of said spindle or pivot bolt.

In the construction illustrated the sighting member or frame consists of the parallel upper and lower' bars 23 and 24:V con- 90 nected by upright 25, and fitted upon the upper bar for adjustment longitudinally thereof are the sighting blocks 26 and 27 f having an interlocking connection with the bar as by a dove-tailed joint 28-and being 95 adapted to be secured at the desired adjustment by set screws 29. One of the. sight blocks is provided with a peep sight 30, and the other wit-h an object opening 31 fitted with cross-hairs 32 to insure accuracy in 100 sighting.

Having thus described the invention7 what I claim is :-l y

An instrument of the class described hav-` ing a disk-like base, supporting legs vpivote-d thereto, a xed disk-like plate on said base, a disk-like transit plate above said fixed plate, said base and plate being substanto permit rotation, axial SliclingandA tilting movement of the transit plate With respect yto the xecl plate, a ,spring snrnoiinding,

said bolt below the base and 4urlgfiligg; wthe transit plate toward the fixed plate, an adjusting nut on said bolt engaged by said sp/iginq, andfl a. pliiraliitfy7 leveling vsQreWs 10 exten' ingrt-.tirouglr thebaSe anclL fixedr plate adapted'. to engage the transit plate. Y

`lin, tersvtlignpny Where ax my signature. il' OMAS C. LANE. 

